China Zhenglan Cable Technology Co., Ltd Company News

ACSR cable is a kind of steel-cored aluminum stranded cable, which has the characteristics of simple structure, easy erection and maintenance, low cost, large transmission capacity, and convenient for laying across rivers and valleys and other special geographical conditions, as well as good electrical conductivity, sufficient mechanical strength, high tensile strength, and the distance of tower pole can be enlarged.Therefore, it is widely used in various voltage levels of overhead transmission and distribution lines.

1. Skin burning method: Ironing the insulation layer with an electric iron should have no obvious dents. If there are large dents, it indicates that the material or process used for the insulation layer is defective.After a long time of burning, the insulation layer of the cable is still relatively intact. There is no smoke or irritant smell. At the same time, the diameter increases.If it is easily ignited, it can be ascertained that the insulation layer of the cable is not made of a low smoke halogen-free material (most likely polyethylene or crosslinked polyethylene).If there is a large amount of smoke, the insulating layer is made of halogenated material. 2, hot water soaking method: put the core wire or cable in 90 ℃ hot water immersion, insulation resistance will not normally fell sharply and keep above 0.1 M Ω / Km.Ω such as insulation resistance fell sharply even less than 0.009 M/Km, then without proper irradiation crosslinking process.(Polyethylene or crosslinked polyethylene insulation materials do not apply to this method of identification, can be identified using the same method). 3. Density comparison method: The density of low-smoke halogen-free material is higher than that of water, so a little insulation layer can be removed and put into water. If the material floats above the water surface, it is definitely not low-smoke halogen-free material. Know to use low smoke zero halogen cable is good, but still on the market at present there are too many fake inferior cables, committing in the selling point of low smoke zero halogen, if don't understand distinguish true low smoke zero halogen flame retardant cable and bought substandard of defective, it will not only give us when using the use of inconvenience, as well as great potential safety hazard, so be sure to understand correctly distinguish between low smoke zero halogen cables.

The copper material always has a residual oxide film at the external temperature, and this oxide film is formed on the high-temperature, continuously cast copper rod when the copper wire enters the hot rod rolling stage.Oxide films are harmful because they cause many defects in the wire drawing process, such as excessive wear of the wire drawing film, poor solderability, and weak adhesion between enamel film and bare conductor. Drawing die is an important tool for wire production, it is the key to realize normal continuous drawing and ensure the quality of drawn products.To make the drawline to obtain high quality stretch products, not only depends on the raw materials and the drawline die itself material, but also depends on the mold groove design and use of other conditions.At present, with the wide application of high-speed wire drawing machine, the use of wire drawing die plays an important role in the process of wire drawing. In the actual production process of copper wire drawing, there are many kinds of wire drawing lubricants. Their performance varies greatly, which seriously affects the quality of wire rod. Therefore, in order to improve the quality of wire rod and save cost, it is particularly important to choose and use wire drawing lubricants reasonably and correctly. To achieve the above purpose, requires the lube oil base stability, good emulsification, with excellent lubricity, cooling and cleaning, easy to put the copper powder filter with precipitation, always maintain the best in the whole process of lubrication state, so that can form a layer of thin film under high pressure without being destroyed, reduce the friction of work area, improve the quality of drawing.Different lubricants have different advantages and disadvantages, and their use time should be decided according to different characteristics. The annealing of copper single wire is one of the important processes in the production of wire and cable. The electrical property, mechanical property and surface quality of the wire depend largely on the annealing process and production mode. One of the important characteristics of metal plastic deformation is work hardening.With the increase of the degree of deformation, all the indexes in the deformation wave, such as yield limit, strength limit and hardness, increase, while the plasticity indexes, such as elongation rate and section reduction rate, also increase the resistance and decrease the thermal conductivity.This will have a bad effect on the drawing. A cable is a mechanical operation that takes advantage of the plasticity of the material.Machinery used for this purpose may be direct or accumulation, this machine is called wire drawing machine or wire drawing machines, it includes a series of fixed anchor mold, placed between each thread die carrier to make the wire to keep certain tension, wire drawing machine to pull the wire pull mode, the final drawing operation is controlled by a pull force applied behind the mold to complete, after the coil through the wire received.

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When the power cable passes through a certain load current, it will certainly generate heat. With the increase of load current, the surface temperature of the cable will be higher. If it is not handled in time, the consequences can be imagined.Such as: Polyvinyl chloride (PVC) cable, core temperature 70 degrees for the upper limit of consideration, the surface temperature will be low 5 ~ 10 degrees.So the cable surface temperature below 60 degrees is basically safe, from the power maintenance considerations, of course, the lower the temperature is the better. (1) Conductor resistance of the cable does not meet the requirements, resulting in the cable heating phenomenon in operation. (2) Improper cable selection causes the conductor section of the used cable to be too small, resulting in overload in operation. After a long time of use, the imbalance of heating and heat dissipation of the cable will cause heating phenomenon. (3) The cables are arranged too densely, the ventilation and heat dissipation effect is not good, or the cables are too close to other heat sources, which will affect the normal heat dissipation of the cables and may also cause the heating phenomenon in the operation of the cables. (4) Due to poor joint manufacturing technology and tight compression, the contact resistance at the joint is too large and the cable will generate heat. (5) Poor interphase insulation performance of cables, resulting in small insulation resistance and heating phenomenon in operation. (6) Partial sheathing damage of armored cable will cause slow damage to insulation performance after water inlet, gradually reducing insulation resistance and causing heating phenomenon during cable operation.

The expected May Day holiday is juest around the corner. Zhenglan Cable to wish all of you a wonderful, outstanding, cheerful and splendid holiday! Our Holiday from 1st to 5th, return to work on 6th.